My view on swearing in the workplace is that you can only do it if everyone who hears it is one of your immediate peers. Swearing down rank is an abuse of power (lower ranks are expected to be polite). Swearing up is a sign of immaturity (can’t contain emotions, etc).

Also swearing should only be used verbally and only in humorous ways: “this code I wrote is fubar” is ok, “Johnson is an asshole” is not.